Adjustable barrel and receiver connection



July 7', 1959 E. w. HAlLsToN ETAL 2,893,153

'ADJUSTABLE BARREL AND RECEIVER CONNECTION Original Filed April 19, 1955 ADJUSTABLE BARREL AND RECEIVER CONNECTION 'Ellis William Hailston and Harold L. Hameister, Ilion, N.Y., assignors to Remington Arms Company, Inc., Bridgeport, Conn., a corporation of Delaware Original application January 19, 1955, Serial No. 482,726,

now Patent No. 2,751,702, dated June 26, 1956. Di-

vided and this application February 8,1956, Serial No. 564,248

2 Claims. (Cl. 42-75) This application is a division of our pending application, Serial Number 482,726, tiled January 19, 1955, now Patent No. 2,751,702, issued June 26, 1956.

This invention relates to an improved breech loading magazine lirearm of the type characterized by a rearwardly sliding breech block.

More particularly, this invention relates to an improved connection for securing a rearm barrel to a rearm receiver.

An object is to provide a barrel and receiver connection which is adjustable to permit exact positioning of a rearrn barrel with respect to a iirearm receiver.

A further object is to provide an adjustable barrel and receiver connection of great rigidity.

A further object is to provide a barrel and receiver connection adjustable to initially position a barrel within a receiver, which connection, once adjusted, will permit the barrel and receiver to be taken down and be reassembled in exact relative position without further adjustment.

Further objects, advantages and salient features will become apparent from a consideration o'f the description to follow, the accompanying drawings, and the appended claims.

Fig. 1 is a longitudinal vertical sectional view through a firearm embodying our invention.

Fig. 2 is an enlarged partial longitudinal vertical view, partially in section, including only the barrel and receiver to more clearly show the barrel and receiver connection of our invention.

Referring to the drawings, it will be seen that our nvention is embodied in a slide action magazine firearm having a barrel 1, a receiver 2 and a buttstock 3 as basic structural units. A re control unit 4 is supported in the receiver and is of the type disclosed in U.S. Patent No. 2,675,638, issued on April 20, 1954, to L. R. Crittendon and used commercially by applicants assignee. A breech bolt 5 is mounted for reciprocation in the receiver, and is shown in Fig. l in closed position. Beneath the barrel 2, a tubular magazine 6 is supported by hardened hangers secured to the barrel. The hardened hanger 11, which is a part of our invention, supports the breech end of the tubular magazine in a bore formed in the hanger.

The receiver 2 of this construction is conveniently an aluminum die casting, permitting a relatively intricate shape with a minimum of machining. Great economy in the use of material is obtained by forming the receiver by die casting as opposed to machining in which a large amount of metal is reduced to useless chips.

It will be noted that the barrel 1 extends for a considerable distance into the receiver 2. The breech bolt 5 is provided with a cartridge head engaging stem 14 which reciprocates in a closely fitting bolt stem guideway 12 formed in the barrel concentric to the barrel chamber 13. As more completely described in the aforementioned f tes o, Patent '2,893,153 `Patented July 7, 1959` 2 parent application, it is desirable to adjust the' head space of the rie by moving the barrel longitudinally along its axis with respect to the receiver and the receiver-carried breech block 5. Our invention provides such adjustment in the connection between the barrel and receiver and will now be described.

Barrel 1 has secured rigidly thereto a hardened foreend hanger 11. A bore formed in the hanger 11 receives the breech end of the tubular magazine 6 and supports it in alignment with a cartridge track 17 formed in a forward extension 2a of the receiver 2.

It will be seen that when the bushing 10 is rotated, the eccentricity of the screw 9 with respect to the center of the bushing will cause the barrel 1 to be moved longitudinally with respect to the receiver 2. A means is thus provided for adjusting the head space of the rearm by longitudinally moving the barrel relative to the receiver.

When the desired adjustment of the barrel in the receiver has been obtained, the bushing 10 may be fixed in the receiver extension 2a by staking or other means.

When it is desired to separate the barrel and attached magazine from the receiver for any reason, it is only necessary to remove the screw 9. On reassembly off the barrel and receiver, screw 9 is again engaged with the hanger 11 through the bushing 10. It is obvious that if the eccentric bushing is fixed against rotation in the receiver extension 2a, the barrel or reassembly will be returned to exactly the same position in the receiver as it occupied before the firearm was disassembled.

The relatively large surface area of the bushing 10 in contact with the receiver extension 2a effectively increases the load bearing area of the receiver. The increase in load bearing area in the receiver insures that the receiver not be deformed by stresses imposed on the barrel in the use ot the rifle, and enhances the rigidity of the construction.

Although our invention has been described in its application to a slide action manually operated ritle having a tubular magazine, it should be obvious that our invention is equally applicable to other types of iirearms, particularly those in which it is advantageous to adjust the position of a barrel relative to a receiver.

It is accordingly intended that the claims to follow should be construed in terms of the broad teachings set forth, and not as limited to the exact embodiment illustrated.

We claim:

l. In a rearm having a receiver, a reciprocable breech bolt in said receiver movable to a xed forward locking position, and a barrel longitudinally positionable in said receiver relative to said forward locking position of said breech bolt for adjustment of headspace, the improvement of adjustable means *for securing said barrel to said receiver in desired longitudinal position comprising a threaded hanger dependent from said barrel, a forward extension on said receiver underlying said hanger and having a hole in substantial alignment with the dependent end of said hanger, a bushing rotatably disposed in said hole and having an opening therethrough which isl eccentric to said hole, and a screw disposed in said bushing opening and engaged with said threaded hanger.

2. In a firearm having a receiver; a reciprocable breech bolt in said receiver movable to a iixed forward locking position, and an assembly extending forwardly from said receiver, comprising a barrel and a magazine tube coextensive with and underlying said barrel; said assembly being longitudinally positionable in said receiver relative to said breech bolt for adjustment of head space; the improvement of adjustable means for securing said assembly in said receiver for proper head space comprising a hanger dependent from said barrel and having thereon support means for said magazine tube and a Y References Cited in the le of this patent UNITED STATESI PATENTS Goodman Nov. 20, 1883 Hartley et al July 22, 1902 Fay May 31, 1904 Lowe Feb. 13, 1945 

